Check DNS, Urls + Redirects, Certificates and Content of your Website


 

 

V

 

Connect failure - perhaps firewall

 

Checked:
04.02.2025 16:52:44

 

Older results

No older results found

 

1. IP-Addresses

HostTypeIP-Addressis auth.∑ Queries∑ Timeout
dautucungkieu.info.vn
A
103.18.6.109
Ô Chợ Dừa/Hanoi/Vietnam (VN) - RUNSYSTEM
Hostname: redirect-frame.tenten.vn
yes
2
0

AAAA

yes


www.dautucungkieu.info.vn
CNAME
dautucungkieu.info.vn
yes
1
0

A
103.18.6.109
Ô Chợ Dừa/Hanoi/Vietnam (VN) - RUNSYSTEM
Hostname: redirect-frame.tenten.vn
yes


*.dautucungkieu.info.vn
A
103.18.6.109
yes



AAAA

yes



CNAME

yes


 

2. DNSSEC

Zone (*)DNSSEC - Informations


Zone: (root)

(root)
1 DS RR published






DS with Algorithm 8, KeyTag 20326, DigestType 2 and Digest 4G1EuAuPHTmpXAsNfGXQhFjogECbvGg0VxBCN8f47I0=






Status: Valid because published






3 DNSKEY RR found






Public Key with Algorithm 8, KeyTag 20326, Flags 257 (SEP = Secure Entry Point)






Public Key with Algorithm 8, KeyTag 26470, Flags 256






Public Key with Algorithm 8, KeyTag 38696, Flags 257 (SEP = Secure Entry Point)






1 RRSIG RR to validate DNSKEY RR found






RRSIG-Owner (root), Algorithm: 8, 0 Labels, original TTL: 172800 sec, Signature-expiration: 21.02.2025, 00:00:00 +, Signature-Inception: 31.01.2025, 00:00:00 +, KeyTag 20326, Signer-Name: (root)






Status: Good - Algorithmus 8 and DNSKEY with KeyTag 20326 used to validate the DNSKEY RRSet






Status: Valid Chain of trust. Parent-DS with Algorithm 8, KeyTag 20326, DigestType 2 and Digest "4G1EuAuPHTmpXAsNfGXQhFjogECbvGg0VxBCN8f47I0=" validates local Key with the same values, Key ist Secure Entry Point (SEP) of the zone



Zone: vn

vn
2 DS RR in the parent zone found






DS with Algorithm 8, KeyTag 16196, DigestType 2 and Digest y2jFOEEEsx4dnLwcRfhhqSzanYEhr+dvmol4UnmD/Zk=






DS with Algorithm 8, KeyTag 16196, DigestType 4 and Digest J2ZD9e9DoGECd8BsxSYQVnKEULFYSzT20Z9MW9ndHe/y1dPLgFuGcYseB3hoKv6R






1 RRSIG RR to validate DS RR found






RRSIG-Owner vn., Algorithm: 8, 1 Labels, original TTL: 86400 sec, Signature-expiration: 17.02.2025, 05:00:00 +, Signature-Inception: 04.02.2025, 04:00:00 +, KeyTag 26470, Signer-Name: (root)






Status: Good - Algorithmus 8 and DNSKEY with KeyTag 26470 used to validate the DS RRSet in the parent zone






2 DNSKEY RR found






Public Key with Algorithm 8, KeyTag 16196, Flags 257 (SEP = Secure Entry Point)






Public Key with Algorithm 8, KeyTag 52956, Flags 256






2 RRSIG RR to validate DNSKEY RR found






RRSIG-Owner vn., Algorithm: 8, 1 Labels, original TTL: 43200 sec, Signature-expiration: 14.02.2025, 21:18:08 +, Signature-Inception: 15.01.2025, 21:08:32 +, KeyTag 16196, Signer-Name: vn






RRSIG-Owner vn., Algorithm: 8, 1 Labels, original TTL: 43200 sec, Signature-expiration: 14.02.2025, 21:18:08 +, Signature-Inception: 15.01.2025, 21:08:32 +, KeyTag 52956, Signer-Name: vn






Status: Good - Algorithmus 8 and DNSKEY with KeyTag 16196 used to validate the DNSKEY RRSet






Status: Good - Algorithmus 8 and DNSKEY with KeyTag 52956 used to validate the DNSKEY RRSet






Status: Valid Chain of trust. Parent-DS with Algorithm 8, KeyTag 16196, DigestType 2 and Digest "y2jFOEEEsx4dnLwcRfhhqSzanYEhr+dvmol4UnmD/Zk=" validates local Key with the same values, Key ist Secure Entry Point (SEP) of the zone






Status: Valid Chain of trust. Parent-DS with Algorithm 8, KeyTag 16196, DigestType 4 and Digest "J2ZD9e9DoGECd8BsxSYQVnKEULFYSzT20Z9MW9ndHe/y1dPLgFuGcYseB3hoKv6R" validates local Key with the same values, Key ist Secure Entry Point (SEP) of the zone



Zone: info.vn

info.vn
2 DS RR in the parent zone found






DS with Algorithm 8, KeyTag 6899, DigestType 2 and Digest 7mj+48JT7fNW8nrYX9qanH5gcc5ojJYu/4bK3ccns3k=






DS with Algorithm 8, KeyTag 6899, DigestType 4 and Digest 2TUq0iTil/e/S7w+zLjBnAG1YEoXVhP8gNPW9Rt85uUNeiJ5PySkJe5N7LUvLJlO






1 RRSIG RR to validate DS RR found






RRSIG-Owner info.vn., Algorithm: 8, 2 Labels, original TTL: 43200 sec, Signature-expiration: 28.02.2025, 18:15:10 +, Signature-Inception: 29.01.2025, 17:20:52 +, KeyTag 52956, Signer-Name: vn






Status: Good - Algorithmus 8 and DNSKEY with KeyTag 52956 used to validate the DS RRSet in the parent zone






2 DNSKEY RR found






Public Key with Algorithm 8, KeyTag 6899, Flags 257 (SEP = Secure Entry Point)






Public Key with Algorithm 8, KeyTag 39490, Flags 256






2 RRSIG RR to validate DNSKEY RR found






RRSIG-Owner info.vn., Algorithm: 8, 2 Labels, original TTL: 43200 sec, Signature-expiration: 14.02.2025, 22:02:33 +, Signature-Inception: 15.01.2025, 21:44:59 +, KeyTag 6899, Signer-Name: info.vn






RRSIG-Owner info.vn., Algorithm: 8, 2 Labels, original TTL: 43200 sec, Signature-expiration: 14.02.2025, 22:02:33 +, Signature-Inception: 15.01.2025, 21:44:59 +, KeyTag 39490, Signer-Name: info.vn






Status: Good - Algorithmus 8 and DNSKEY with KeyTag 6899 used to validate the DNSKEY RRSet






Status: Good - Algorithmus 8 and DNSKEY with KeyTag 39490 used to validate the DNSKEY RRSet






Status: Valid Chain of trust. Parent-DS with Algorithm 8, KeyTag 6899, DigestType 4 and Digest "2TUq0iTil/e/S7w+zLjBnAG1YEoXVhP8gNPW9Rt85uUNeiJ5PySkJe5N7LUvLJlO" validates local Key with the same values, Key ist Secure Entry Point (SEP) of the zone






Status: Valid Chain of trust. Parent-DS with Algorithm 8, KeyTag 6899, DigestType 2 and Digest "7mj+48JT7fNW8nrYX9qanH5gcc5ojJYu/4bK3ccns3k=" validates local Key with the same values, Key ist Secure Entry Point (SEP) of the zone



Zone: dautucungkieu.info.vn

dautucungkieu.info.vn
0 DS RR in the parent zone found






DS-Query in the parent zone has a valid NSEC3 RR as result with the hashed query name "fu19bomvjabe81g66isr27fr9djim4ug" between the hashed NSEC3-owner "f4hi1eu6kvcmth6gpvaqnvp2c701o9ig" and the hashed NextOwner "hgvtortfmalhf54v4vsgcls9sq7hg022". So the parent zone confirmes the not-existence of a DS RR.
Bitmap: NS, DS, RRSIG Validated: RRSIG-Owner f4hi1eu6kvcmth6gpvaqnvp2c701o9ig.info.vn., Algorithm: 8, 3 Labels, original TTL: 5400 sec, Signature-expiration: 17.02.2025, 20:08:36 +, Signature-Inception: 18.01.2025, 19:14:53 +, KeyTag 39490, Signer-Name: info.vn






DS-Query in the parent zone sends valid NSEC3 RR with the Hash "09j0gr913cfa66cteb2hbi3av181k0aa" as Owner. That's the Hash of "info.vn" with the NextHashedOwnerName "0erv91gis5ibkr9igtdetlkv9q28e999". So that domain name is the Closest Encloser of "dautucungkieu.info.vn". Opt-Out: True.
Bitmap: NS, SOA, RRSIG, DNSKEY, NSEC3PARAM Validated: RRSIG-Owner 09j0gr913cfa66cteb2hbi3av181k0aa.info.vn., Algorithm: 8, 3 Labels, original TTL: 5400 sec, Signature-expiration: 18.02.2025, 10:10:25 +, Signature-Inception: 19.01.2025, 09:37:13 +, KeyTag 39490, Signer-Name: info.vn






0 DNSKEY RR found









Zone: www.dautucungkieu.info.vn

www.dautucungkieu.info.vn
0 DS RR in the parent zone found

 

3. Name Servers

DomainNameserverNS-IP
dautucungkieu.info.vn
  ns-b1.tenten.vn
137.59.104.67
Hanoi/Vietnam (VN) - GMO-Z.com Runsystem Joint Stock Company


 
2404:f080:1101:321:a150:95:110:1230
Làng Hà/Vĩnh Phúc Province/Vietnam (VN) - RUNSYSTEM


  ns-b2.tenten.vn
137.59.104.68
Hanoi/Vietnam (VN) - GMO-Z.com Runsystem Joint Stock Company


 
2404:f080:1101:321:a150:95:110:1231
Làng Hà/Vĩnh Phúc Province/Vietnam (VN) - RUNSYSTEM


  ns-b3.tenten.vn
163.44.207.21
Hanoi/Vietnam (VN) - GMO-Z.com Runsystem Joint Stock Company


 
2404:f080:1101:321:a150:95:110:1232
Làng Hà/Vĩnh Phúc Province/Vietnam (VN) - RUNSYSTEM

info.vn
  a.dns-servers.vn
194.0.1.18
Christchurch/England/United Kingdom (GB) - ICB plc Anycast (via NetConnex AS21396)


 
2001:678:4::12
Frankfurt am Main/Hesse/Germany (DE) - Community DNS Limited


  b.dns-servers.vn
203.119.73.105
Hai BàTrưng/Hanoi/Vietnam (VN) - VNNIC


 
2001:dc8:1:2::105
Hanoi/Vietnam (VN) - Vietnam Internet network information center


  c.dns-servers.vn
203.119.38.105
Hanoi/Vietnam (VN) - VNNIC


 
2001:dc8:c000:7::105
Hanoi/Vietnam (VN) - Vietnam Internet Network Information Center


  d.dns-servers.vn
203.119.44.105
Hai BàTrưng/Hanoi/Vietnam (VN) - VNNIC


 
2001:dc8:8000:2::105
Hanoi/Vietnam (VN) - VNNIC


  dns-master.vnnic.vn


  e.dns-servers.vn
203.119.60.105
Hai BàTrưng/Hanoi/Vietnam (VN) - VNNIC


 
2001:dc8:1000:2::105
Hanoi/Vietnam (VN) - Vietnam Internet network information center


  f.dns-servers.vn
203.119.68.105
Hai BàTrưng/Hanoi/Vietnam (VN) - Vietnam Internet Network Information Center


 
2001:dc8:d000:2::105
Hanoi/Vietnam (VN) - VNNIC


  g.dns-servers.vn / 5.ams.pch
204.61.216.115
Montreal/Quebec/Canada (CA) - WoodyNet, Inc.


 
2001:500:14:6115:ad::1
Montreal/Quebec/Canada (CA) - WoodyNet, Inc.


  h.dns-servers.vn
202.47.142.105
Hanoi/Vietnam (VN) - Vietnam Internet Network Information Center


 
2001:dc8:6000::105
Hanoi/Vietnam (VN) - VNNIC DNS Anycast

vn
T  a.dns-servers.vn


  b.dns-servers.vn


  c.dns-servers.vn


  d.dns-servers.vn


  dns-master.vnnic.vn


  e.dns-servers.vn


  f.dns-servers.vn


  g.dns-servers.vn / 6.ams.pch


  h.dns-servers.vn

 

4. SOA-Entries


Domain:vn
Zone-Name:
Primary:
Mail:
Serial:
Refresh:
Retry:
Expire:
TTL:
num Entries:2


Domain:vn
Zone-Name:vn
Primary:dns-master.vnnic.vn
Mail:postmaster.vnnic.vn
Serial:2029025847
Refresh:3600
Retry:1800
Expire:604800
TTL:5400
num Entries:7


Domain:info.vn
Zone-Name:
Primary:
Mail:
Serial:
Refresh:
Retry:
Expire:
TTL:
num Entries:1


Domain:info.vn
Zone-Name:info.vn
Primary:dns-master.vnnic.vn
Mail:postmaster.vnnic.vn
Serial:2017752456
Refresh:3600
Retry:1800
Expire:604800
TTL:5400
num Entries:16


Domain:dautucungkieu.info.vn
Zone-Name:dautucungkieu.info.vn
Primary:ns-b3.tenten.vn
Mail:noreply.tenten.vn
Serial:1738652756
Refresh:3510
Retry:600
Expire:86400
TTL:3600
num Entries:6


5. Screenshots

No Screenshot listed, because no url-check with https + http status 200-299, 400-599 + not-ACME-check found.

 

 

6. Url-Checks


:

:
DomainnameHttp-StatusredirectSec.G
• http://dautucungkieu.info.vn/
103.18.6.109
200

Html is minified: 100.86 %
1.093
H
Date: Tue, 04 Feb 2025 15:54:19 GMT
Server: Apache/2.4.6,(CentOS),OpenSSL/1.0.1e-fips,PHP/5.4.16
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8
Content-Length: 117

• http://www.dautucungkieu.info.vn/
103.18.6.109
200

Html is minified: 100.86 %
0.687
H
Date: Tue, 04 Feb 2025 15:54:19 GMT
Server: Apache/2.4.6,(CentOS),OpenSSL/1.0.1e-fips,PHP/5.4.16
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8
Content-Length: 117

• https://dautucungkieu.info.vn/
103.18.6.109
-102


1.967
V
ConnectionError (2, 0x80004005). Es konnte keine Verbindung hergestellt werden, da der Zielcomputer die Verbindung verweigerte. (103.18.6.109:443)

• https://www.dautucungkieu.info.vn/
103.18.6.109
-102


1.986
V
ConnectionError (2, 0x80004005). Es konnte keine Verbindung hergestellt werden, da der Zielcomputer die Verbindung verweigerte. (103.18.6.109:443)

• http://dautucungkieu.info.vn/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
103.18.6.109
Inline-JavaScript (∑/total): 0/0 Inline-CSS (∑/total): 0/0
404

Html is minified: 102.69 %
Other inline scripts (∑/total): 0/0
0.330
A
Not Found
Visible Content:
Date: Tue, 04 Feb 2025 15:54:24 GMT
Server: Apache/2.4.6,(CentOS),OpenSSL/1.0.1e-fips,PHP/5.4.16
Content-Length: 267
Content-Type: text/html; charset=iso-8859-1

• http://www.dautucungkieu.info.vn/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
103.18.6.109
Inline-JavaScript (∑/total): 0/0 Inline-CSS (∑/total): 0/0
404

Html is minified: 102.69 %
Other inline scripts (∑/total): 0/0
0.327
A
Not Found
Visible Content:
Date: Tue, 04 Feb 2025 15:54:24 GMT
Server: Apache/2.4.6,(CentOS),OpenSSL/1.0.1e-fips,PHP/5.4.16
Content-Length: 267
Content-Type: text/html; charset=iso-8859-1

• https://103.18.6.109/
103.18.6.109
-102


1.954
V
ConnectionError (2, 0x80004005). Es konnte keine Verbindung hergestellt werden, da der Zielcomputer die Verbindung verweigerte. (103.18.6.109:443)

 

7. Comments


1. General Results, most used to calculate the result

Aname "dautucungkieu.info.vn" is domain, public suffix is ".info.vn", top-level-domain is ".vn", top-level-domain-type is "country-code", Country is Viet Nam, tld-manager is "Ministry of Information and Communications of Socialist Republic of Viet Nam", num .vn-domains preloaded: 373 (complete: 263653)
AGood: All ip addresses are public addresses
Warning: Only one ip address found: dautucungkieu.info.vn has only one ip address.
Warning: Only one ip address found: www.dautucungkieu.info.vn has only one ip address.
Warning: No ipv6 address found. Ipv6 is the future with a lot of new features. So every domain name should have an ipv6 address. See https://en.wikipedia.org/wiki/IPv6: dautucungkieu.info.vn has no ipv6 address.
Warning: No ipv6 address found. Ipv6 is the future with a lot of new features. So every domain name should have an ipv6 address. See https://en.wikipedia.org/wiki/IPv6: www.dautucungkieu.info.vn has no ipv6 address.
AGood: No cookie sent via http.
HSTS-Preload-Status: unknown. Domain never included in the Preload-list. Check https://hstspreload.org/ to learn some basics about the Google-Preload-List.
AGood: All urls with http status 200/404 have a complete Content-Type header (MediaType / MediaSubType + correct charset)
HFatal error: No https - result with http-status 200, no encryption
HFatal error: http result with http-status 200, no encryption. Add a redirect http ⇒ https, so every connection is secure. Perhaps in your port 80 vHost something like "RewriteEngine on" + "RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,QSA,R=permanent]" (two rows, without the "). Don't add this in your port 443 vHost, that would create a loop.
Vhttps://dautucungkieu.info.vn/ 103.18.6.109
-102

Connect failure - perhaps firewall
Vhttps://www.dautucungkieu.info.vn/ 103.18.6.109
-102

Connect failure - perhaps firewall
Vhttps://103.18.6.109/ 103.18.6.109
-102

Connect failure - perhaps firewall
Info: Checking the ip addresses of that domain name not exact one certificate found. So it's impossible to check if that domain requires Server Name Indication (SNI).: Domain dautucungkieu.info.vn, 1 ip addresses.
Info: Checking the ip addresses of that domain name not exact one certificate found. So it's impossible to check if that domain requires Server Name Indication (SNI).: Domain www.dautucungkieu.info.vn, 1 ip addresses.
BNo _mta-sts TXT record found (mta-sts: Mail Transfer Agent Strict Transport Security - see RFC 8461). Read the result of server-daten.de (Url-Checks, Comments, Connections and DomainServiceRecords) to see a complete definition. Domainname: _mta-sts.dautucungkieu.info.vn

2. Header-Checks

U

No https result with http status 2** or 4** (standard-check) found, no header checked.

3. DNS- and NameServer - Checks

AInfo:: 10 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 3 Name Servers.
AInfo:: 10 Queries complete, 4 with IPv6, 6 with IPv4.
Warning: Only some DNS Queries done via ipv6. IPv6 is the future, so the name servers of your name servers should have ipv6 addresses.
Ok (4 - 8):: An average of 3.3 queries per domain name server required to find all ip addresses of all name servers.
AInfo:: 3 different Name Servers found: ns-b1.tenten.vn, ns-b2.tenten.vn, ns-b3.tenten.vn, 3 Name Servers included in Delegation: ns-b1.tenten.vn, ns-b2.tenten.vn, ns-b3.tenten.vn, 3 Name Servers included in 1 Zone definitions: ns-b1.tenten.vn, ns-b2.tenten.vn, ns-b3.tenten.vn, 1 Name Servers listed in SOA.Primary: ns-b3.tenten.vn.
AGood: Only one SOA.Primary Name Server found.: ns-b3.tenten.vn.
AGood: SOA.Primary Name Server included in the delegation set.: ns-b3.tenten.vn.
AGood: Consistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Ordered list of name servers: ns-b1.tenten.vn, ns-b2.tenten.vn, ns-b3.tenten.vn
AGood: All Name Server Domain Names have a Public Suffix.
AGood: All Name Server Domain Names ending with a Public Suffix have minimal one IPv4- or IPv6 address.
AGood: All Name Server ip addresses are public.
AGood: Minimal 2 different name servers (public suffix and public ip address) found: 3 different Name Servers found
AGood: All name servers have ipv4- and ipv6-addresses.: 3 different Name Servers found
Warning: All Name Servers have the same Top Level Domain / Public Suffix. If there is a problem with that Top Level Domain, your domain may be affected. Better: Use Name Servers with different top level domains.: 3 Name Servers, 1 Top Level Domain: vn
Warning: All Name Servers have the same domain name. If there is a problem with that domain name (or with the name servers of that domain name), your domain may be affected. Better: Use Name Servers with different domain names / different top level domains.: Only one domain name used: tenten.vn
Warning: All Name Servers from the same Country / IP location.: 3 Name Servers, 1 Countries: VN
AInfo: Ipv4-Subnet-list: 3 Name Servers, 2 different subnets (first Byte): 137., 163., 2 different subnets (first two Bytes): 137.59., 163.44., 2 different subnets (first three Bytes): 137.59.104., 163.44.207.
AGood: Name Server IPv4-addresses from different subnet found:
AInfo: IPv6-Subnet-list: 3 Name Servers with IPv6, 1 different subnets (first block): 2404:, 1 different subnets (first two blocks): 2404:f080:, 1 different subnets (first three blocks): 2404:f080:1101:, 1 different subnets (first four blocks): 2404:f080:1101:0321:
Fatal: All Name Server IPv6 addresses from the same subnet.
AGood: Nameserver supports TCP connections: 6 good Nameserver
AGood: Nameserver supports Echo Capitalization: 6 good Nameserver
AGood: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 6 good Nameserver
XNameserver Timeout checking EDNS512: a.dns-servers.vn
AGood: Nameserver has passed 10 EDNS-Checks (OP100, FLAGS, V1, V1OP100, V1FLAGS, DNSSEC, V1DNSSEC, NSID, COOKIE, CLIENTSUBNET): 6 good Nameserver
Nameserver doesn't pass all EDNS-Checks: a.dns-servers.vn: OP100: ok. FLAGS: ok. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok. COOKIE: ok. CLIENTSUBNET: ok.
Nameserver doesn't pass all EDNS-Checks: c.dns-servers.vn / 203.119.38.105: OP100: ok. FLAGS: ok. V1: fatal timeout. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok. COOKIE: ok. CLIENTSUBNET: ok.
Nameserver doesn't pass all EDNS-Checks: dns-master.vnnic.vn: OP100: no result. FLAGS: no result. V1: no result. V1OP100: no result. V1FLAGS: no result. DNSSEC: no result. V1DNSSEC: no result. NSID: no result. COOKIE: no result. CLIENTSUBNET: no result.
Nameserver doesn't pass all EDNS-Checks: dns-master.vnnic.vn: OP100: no result. FLAGS: no result. V1: no result. V1OP100: no result. V1FLAGS: no result. DNSSEC: no result. V1DNSSEC: no result. NSID: no result. COOKIE: no result. CLIENTSUBNET: no result.
AGood: All SOA have the same Serial Number
Warning: No CAA entry with issue/issuewild found, every CAA can create a certificate. Read https://en.wikipedia.org/wiki/DNS_Certification_Authority_Authorization to learn some basics about the idea of CAA. Your name server must support such an entry. Not all dns providers support CAA entries.

4. Content- and Performance-critical Checks

AGood: All checks /.well-known/acme-challenge/random-filename without redirects answer with the expected http status 404 - Not Found. Creating a Letsencrypt certificate via http-01 challenge should work. If it doesn't work: Check your vHost configuration (apachectl -S, httpd -S, nginx -T). Every combination of port and ServerName / ServerAlias (Apache) or Server (Nginx) must be unique. Merge duplicated entries in one vHost. If you use an IIS, extensionless files must be allowed in the /.well-known/acme-challenge subdirectory. Create a web.config in that directory. Content: <configuration><system.webServer><staticContent><mimeMap fileExtension="." mimeType="text/plain" /></staticContent></system.webServer></configuration>. If you have a redirect http ⇒ https, that's ok, Letsencrypt follows such redirects to port 80 / 443 (same or other server). There must be a certificate. But the certificate may be expired, self signed or with a not matching domain name. Checking the validation file Letsencrypt ignores such certificate errors. Trouble creating a certificate? Use https://community.letsencrypt.org/ to ask.
AInfo: No img element found, no alt attribute checked
AGood: Domainname is not on the "Specially Designated Nationals And Blocked Persons List" (SDN). That's an US-list of individuals and companies owned or controlled by, or acting for or on behalf of, targeted countries. It also lists individuals, groups, and entities, such as terrorists and narcotics traffickers designated under programs that are not country-specific. Collectively, such individuals and companies are called "Specially Designated Nationals" or "SDNs." Their assets are blocked and U.S. persons are generally prohibited from dealing with them. So if a domain name is on that list, it's impossible to create a Letsencrypt certificate with that domain name. Check the list manual - https://www.treasury.gov/resource-center/sanctions/sdn-list/pages/default.aspx
ADuration: 372036 milliseconds, 372.036 seconds

 

8. Connections

No connection informations found. Perhaps only http - connections.

 

9. Certificates

No certificate informations found. Perhaps only http - connections.

 

10. Last Certificates - Certificate Transparency Log Check

1. Source CertSpotter - active certificates (one check per day)

No CertSpotter - CT-Log entries found

 

2. Source crt.sh - old and new certificates, sometimes very slow - only certificates with "not after" > of the last months are listed

No CRT - CT-Log entries found

 

11. Html-Content - Entries

No Html-Content entries found. Only checked if https + status 200/401/403/404

 

12. Html-Parsing via https://validator.w3.org/nu/


No https result http status 200 and Content-Type text/html or text/xml found, no Html-Parsing - Check

 

13. Nameserver - IP-Adresses

Required Root-climbing DNS-Queries to find ip addresses of all Name Servers: ns-b1.tenten.vn, ns-b2.tenten.vn, ns-b3.tenten.vn

 

QNr.DomainTypeNS used
1
vn
NS
k.root-servers.net (2001:7fd::1)

Answer: a.dns-servers.vn, b.dns-servers.vn, c.dns-servers.vn, d.dns-servers.vn, e.dns-servers.vn, f.dns-servers.vn, g.dns-servers.vn, h.dns-servers.vn
2
ns-b1.tenten.vn
NS
a.dns-servers.vn (2001:678:4::12)

Answer: ns1.tenten.vn, ns2.tenten.vn, ns3.tenten.vn

Answer: ns1.tenten.vn
103.18.7.201

Answer: ns2.tenten.vn
103.18.7.202

Answer: ns3.tenten.vn
133.130.107.205
3
ns-b2.tenten.vn
NS
a.dns-servers.vn (2001:678:4::12)

Answer: ns1.tenten.vn, ns2.tenten.vn, ns3.tenten.vn

Answer: ns1.tenten.vn
103.18.7.201

Answer: ns2.tenten.vn
103.18.7.202

Answer: ns3.tenten.vn
133.130.107.205
4
ns-b3.tenten.vn
NS
a.dns-servers.vn (2001:678:4::12)

Answer: ns1.tenten.vn, ns2.tenten.vn, ns3.tenten.vn

Answer: ns1.tenten.vn
103.18.7.201

Answer: ns2.tenten.vn
103.18.7.202

Answer: ns3.tenten.vn
133.130.107.205
5
ns-b1.tenten.vn: 137.59.104.67
A
ns1.tenten.vn (103.18.7.201)
6
ns-b1.tenten.vn: 2404:f080:1101:321:a150:95:110:1230
AAAA
ns1.tenten.vn (103.18.7.201)
7
ns-b2.tenten.vn: 137.59.104.68
A
ns1.tenten.vn (103.18.7.201)
8
ns-b2.tenten.vn: 2404:f080:1101:321:a150:95:110:1231
AAAA
ns1.tenten.vn (103.18.7.201)
9
ns-b3.tenten.vn: 163.44.207.21
A
ns1.tenten.vn (103.18.7.201)
10
ns-b3.tenten.vn: 2404:f080:1101:321:a150:95:110:1232
AAAA
ns1.tenten.vn (103.18.7.201)

 

14. CAA - Entries

DomainnameflagNameValue∑ Queries∑ Timeout
www.dautucungkieu.info.vn



1
0
dautucungkieu.info.vn
0

no CAA entry found
1
0
info.vn
0

no CAA entry found
1
0
vn
0

no CAA entry found
2
1

 

15. TXT - Entries

DomainnameTXT EntryStatus∑ Queries∑ Timeout
dautucungkieu.info.vn
v=spf1 mx a ip4:103.18.6.109 ~all
ok
1
0
www.dautucungkieu.info.vn
v=spf1 mx a ip4:103.18.6.109 ~all
ok
1
0
_acme-challenge.dautucungkieu.info.vn

missing entry or wrong length
1
0
_acme-challenge.www.dautucungkieu.info.vn

Name Error - The domain name does not exist
1
0
_acme-challenge.dautucungkieu.info.vn.dautucungkieu.info.vn

perhaps wrong
1
0
_acme-challenge.www.dautucungkieu.info.vn.dautucungkieu.info.vn

perhaps wrong
1
0
_acme-challenge.www.dautucungkieu.info.vn.www.dautucungkieu.info.vn

Name Error - The domain name does not exist
1
0

 

16. DomainService - Entries

TypeDomainPrefValueDNS-errornum AnswersStatusDescription
MX

dautucungkieu.info.vn
10
mail.dautucungkieu.info.vn
01ok

A


103.18.6.109
01ok

CNAME


00ok

 

 

17. Cipher Suites

No results

 

18. Portchecks

No open Ports <> 80 / 443 found, so no additional Ports checked.

 

 

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